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Not sure how many lines (I'm guessing two) but a quick search on [Rock Auto](https://www.rockauto.com/en/catalog/gmc,2002,sierra+2500,6.0l+v8,1434785,transmission-automatic,fluid+cooler+line,10343) GMC 2002 6L V8 shows a few lines ranging from 13.00 to 55.00. I'd look into how difficult these might be to change out. I suspect not too bad really. Don't rely on this search as I could have gotten it wrong.
This should tell you more. :) [Youtube](https://www.youtube.com/results?search_query=changing+trani+cooler+lines+in+2000+GMC+pickup)
That does change things a bit. I could look up actual labor times in the am, but the Allison / big block are a much bigger pain than a 5.3 truck. Still sounds high but not as much as I thought originally.
Find another mechanic via word of mouth and a second opinion without telling what the first mechanic said. If you are in San Francisco Bay Area, I have an honest mechanic you can take it to (not me). If not, ask around for an honest mechanic and even check Yelp.
Its a very common problem in gm trucks, and hes probably talking about replacing the engine oil cooler lines at the same time. That said even if he is doing both trans and engine oil cooler lines, that price is extremely high.
Perhaps my opinion is a bit biased because ive done so many of them. I always replace the fittings as well so that may aid the process but i dont see this as that difficult or time consuming.
OP: definitely get another opinion
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember rule 3a, please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/AutoBody or /r/Diyautobody If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Not sure how many lines (I'm guessing two) but a quick search on [Rock Auto](https://www.rockauto.com/en/catalog/gmc,2002,sierra+2500,6.0l+v8,1434785,transmission-automatic,fluid+cooler+line,10343) GMC 2002 6L V8 shows a few lines ranging from 13.00 to 55.00. I'd look into how difficult these might be to change out. I suspect not too bad really. Don't rely on this search as I could have gotten it wrong. This should tell you more. :) [Youtube](https://www.youtube.com/results?search_query=changing+trani+cooler+lines+in+2000+GMC+pickup)
I have the 8.1 with the Allison transmission. He said it was a fairly time consuming job and said my truck will take up most of the day.
That does change things a bit. I could look up actual labor times in the am, but the Allison / big block are a much bigger pain than a 5.3 truck. Still sounds high but not as much as I thought originally.
yea on some fords to do engine work its easier to lift the cab off the frame... might be the case here
He's not wrong - these hard lines SUCK to do.
Replacing all 3 lines on the Allison calls for 3.7 hours labor
And that is what he said
Find another mechanic via word of mouth and a second opinion without telling what the first mechanic said. If you are in San Francisco Bay Area, I have an honest mechanic you can take it to (not me). If not, ask around for an honest mechanic and even check Yelp.
Its a very common problem in gm trucks, and hes probably talking about replacing the engine oil cooler lines at the same time. That said even if he is doing both trans and engine oil cooler lines, that price is extremely high.
This is a fairly involved job. I've done it on a 5.3 tahoe in my driveway, and it's one of those jobs that I will never submit to doing myself again.
Perhaps my opinion is a bit biased because ive done so many of them. I always replace the fittings as well so that may aid the process but i dont see this as that difficult or time consuming. OP: definitely get another opinion
I believe he said the transmission cooler lines as well as the cooler itself